Wavefront .OBJ Import Error
That exports and imports perfectly for me, Blender 2.77. However, it's as I suspected, there are a bunch of duplicate vertices which are no doubt causing the error on your end. 

To fix, box select B your entire model, join it into one mesh with CtrlJ, select all with CtrlA, open special menu W and select Remove Doubles. Finally, select everything again in edit mode and use P > Separate by loose parts. You will have to reassign any materials, fix origins and groups after but that should fix the problem and give you a clean obj.